Interesting find on Ebay, they are from a seller in Sri Lanka of all places. The seller had 3 bags for sale, I took a chance and bought 2 bags at a whoping $5 a bag got me 12 pieces per bag of large scale link and pin coupler pockets, they have a thin plastic tab in the back, they are similar but larger than Ozarks end beam mounted coupler which is shown in the pic, these just require a drilled hole and AC in place. So far so good, for the price they are excellent and so far worth the overseas purchase risk. Thought I would share these in case anyone else saw them and was curious as to what they look like.
Have fun with your trains
Sounds (and looks) like you made a major score.
Tom Trigg
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